Senna had complained about the Williams car being cramped (as mentioned) so just before Imola the Williams team modified the steering column to give him more room. It has been suggested that the modification broke, losing steering hence his car going straight on. Williams dispute this with telemtry from the car showing the steering still had force being applied, impossible if the column had broken.
They say that after running behind the safety car (first season a safety car was used in F1, and a slow saloon car at that) the tyres cooled down losing pressure and therefore ride height. The car then bottomed out at the corner and lost all its downforce. That downforce, far greater than the actual weight of the car, was what kept it on the road. Without it it simply did not have enough grip to make the corner.
And it wasn't the steering column that hit him but a bit of the suspension.
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